The most common and most likely answer to this crossword clue is the 6 letter word TOFFEE
I've seen this crossword clue in Financial Times
T
O
F
F
E
E
More clues leading to the result TOFFEE
- Sweet daughter has got scent in vain
- Sweet result of feeding sandwiches
- Sweet, one that’s rich with key energy
- . Sweet reporter’s associated with posh people
- Sweet scent of feeding bottles
- Oddly themed wrapping around stale sweet
- Swell quarters, altogether sweet
- Superior gent getting energy repeatedly from something sweet
- Start talking of payment for suckers
- English couple after dandy candy
Buddy explains!

The straight part
We know that "sweet" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sweet = toffee.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TOFFEE mean?
TOFFEE noun- A type of confectionery made by boiling sugar (or treacle, etc) with butter or milk, then cooling the mixture so that it becomes hard
- A small, individual piece of toffee
- Any kind of sweets; candy
- To coat in toffee.